Bi-cylindrical nail



FIG. 1 is an exploded top perspective view of a bi-cylindrical nail showing my new design;

FIG. 2 is an exploded bottom perspective view thereof;

FIG. 3 is an exploded side view thereof;

FIG. 4 is an exploded top view thereof;

FIG. 5 is an exploded bottom view thereof; and,

FIG. 6 is a top perspective view thereof.

The portions of the bi-cylindrical nail shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a bi-cylindrical nail, as shown and described. 